This article makes perfect sense to me, and doesn't display an anti-bitcoin bias. What he is saying is that you should look at for warning signs at an exchange

This article makes perfect sense to me, and doesn't display an anti-bitcoin bias. What he is saying is that you should look at for warning signs at an exchange, such as a halt of USD withdrawals (in the case of MtGox) or the suspicions around Bitfinex and tether, and treat that exchange as unsafe. Back when MtGox was operating without USD withdrawals, it was still the most talked-about exchange, and many people kept putting their money into it, and didn't withdraw bitcoin from it into their own wallets.